I found it extremely difficult to register in the forums due to highly unreadable CAPTCHA image. Attempts to register keep on returning an error message stating that the registration code does not match the image. I suspect some other problem too. Even in cases where myself and another person could read the image clearly, the same error message returned.
I tried all sorts of tricks like copying the image to a photo editor, enhance the image, change to grey scale etc. I took the help of another person to ensure that both of us see the same code. Nothing worked.
After sustained attempts (I lost count) for an hour or so the registration was accepted. This time I entered the code casually without even verifying!!
Meanwhile I contacted djbob using his personal email id (Don't ask me how I got it!), sent him screen shots and copy of the CAPTCHA image. He acknowledged that there seems to be some problem and the registration goes through after a few attempts. In my case I got it right after many many attempts.
I suspect some problem in matching codes vs images. This will put off many users and you will not even know. There is no obvious method to contact / inform the admin without registering.